fs/gfs2/main.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/gfs2_ondisk.h>
  17 #include <linux/lm_interface.h>
  18 #include <asm/atomic.h>
  19
  20 #include "gfs2.h"
  21 #include "incore.h"
  22 #include "super.h"
  23 #include "sys.h"
  24 #include "util.h"
  25 #include "glock.h"
  26
  27 static void gfs2_init_inode_once(void *foo)
  28 {
  29         struct gfs2_inode *ip = foo;
  30
  31         inode_init_once(&ip->i_inode);
  32         init_rwsem(&ip->i_rw_mutex);
  33         INIT_LIST_HEAD(&ip->i_trunc_list);
  34         ip->i_alloc = NULL;
  35 }
  36
  37 static void gfs2_init_glock_once(void *foo)
  38 {
  39         struct gfs2_glock *gl = foo;
  40
  41         INIT_HLIST_NODE(&gl->gl_list);
  42         spin_lock_init(&gl->gl_spin);
  43         INIT_LIST_HEAD(&gl->gl_holders);
  44         gl->gl_lvb = NULL;
  45         atomic_set(&gl->gl_lvb_count, 0);
  46         INIT_LIST_HEAD(&gl->gl_lru);
  47         INIT_LIST_HEAD(&gl->gl_ail_list);
  48         atomic_set(&gl->gl_ail_count, 0);
  49 }
  50
  51 /**
  52  * init_gfs2_fs - Register GFS2 as a filesystem
  53  *
  54  * Returns: 0 on success, error code on failure
  55  */
  56
  57 static int __init init_gfs2_fs(void)
  58 {
  59         int error;
  60
  61         error = gfs2_sys_init();
  62         if (error)
  63                 return error;
  64
  65         error = gfs2_glock_init();
  66         if (error)
  67                 goto fail;
  68
  69         error = -ENOMEM;
  70         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  71                                               sizeof(struct gfs2_glock),
  72                                               0, 0,
  73                                               gfs2_init_glock_once);
  74         if (!gfs2_glock_cachep)
  75                 goto fail;
  76
  77         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  78                                               sizeof(struct gfs2_inode),
  79                                               0,  SLAB_RECLAIM_ACCOUNT|
  80                                                   SLAB_MEM_SPREAD,
  81                                               gfs2_init_inode_once);
  82         if (!gfs2_inode_cachep)
  83                 goto fail;
  84
  85         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  86                                                 sizeof(struct gfs2_bufdata),
  87                                                 0, 0, NULL);
  88         if (!gfs2_bufdata_cachep)
  89                 goto fail;
  90
  91         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
  92                                               sizeof(struct gfs2_rgrpd),
  93                                               0, 0, NULL);
  94         if (!gfs2_rgrpd_cachep)
  95                 goto fail;
  96
  97         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
  98                                                sizeof(struct gfs2_quota_data),
  99                                                0, 0, NULL);
 100         if (!gfs2_quotad_cachep)
 101                 goto fail;
 102
 103         error = register_filesystem(&gfs2_fs_type);
 104         if (error)
 105                 goto fail;
 106
 107         error = register_filesystem(&gfs2meta_fs_type);
 108         if (error)
 109                 goto fail_unregister;
 110
 111         gfs2_register_debugfs();
 112
 113         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 114
 115         return 0;
 116
 117 fail_unregister:
 118         unregister_filesystem(&gfs2_fs_type);
 119 fail:
 120         gfs2_glock_exit();
 121
 122         if (gfs2_quotad_cachep)
 123                 kmem_cache_destroy(gfs2_quotad_cachep);
 124
 125         if (gfs2_rgrpd_cachep)
 126                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 127
 128         if (gfs2_bufdata_cachep)
 129                 kmem_cache_destroy(gfs2_bufdata_cachep);
 130
 131         if (gfs2_inode_cachep)
 132                 kmem_cache_destroy(gfs2_inode_cachep);
 133
 134         if (gfs2_glock_cachep)
 135                 kmem_cache_destroy(gfs2_glock_cachep);
 136
 137         gfs2_sys_uninit();
 138         return error;
 139 }
 140
 141 /**
 142  * exit_gfs2_fs - Unregister the file system
 143  *
 144  */
 145
 146 static void __exit exit_gfs2_fs(void)
 147 {
 148         gfs2_glock_exit();
 149         gfs2_unregister_debugfs();
 150         unregister_filesystem(&gfs2_fs_type);
 151         unregister_filesystem(&gfs2meta_fs_type);
 152
 153         kmem_cache_destroy(gfs2_quotad_cachep);
 154         kmem_cache_destroy(gfs2_rgrpd_cachep);
 155         kmem_cache_destroy(gfs2_bufdata_cachep);
 156         kmem_cache_destroy(gfs2_inode_cachep);
 157         kmem_cache_destroy(gfs2_glock_cachep);
 158
 159         gfs2_sys_uninit();
 160 }
 161
 162 MODULE_DESCRIPTION("Global File System");
 163 MODULE_AUTHOR("Red Hat, Inc.");
 164 MODULE_LICENSE("GPL");
 165
 166 module_init(init_gfs2_fs);
 167 module_exit(exit_gfs2_fs);
 168